Recording medium cartridge and fabrication method thereof

Abstract

A recording medium cartridge and producing method thereof, such that slidability of resin-fabricated members of different materials against one another can be assured even in conditions in which impacts are successively applied. The recording medium cartridge is provided with a recording medium T and a plurality of resin-fabricated components. A mixture C of perfluoropolyethylene and polytetrafluoroethylene is interposed at boundary surfaces at which the resin-fabricated components of different material slide against one another and/or at boundary surfaces at which the resin-fabricated components of different material slide against one another.

1. A recording medium cartridge comprising a recording medium and a plurality of components fabricated of resin, wherein a mixture including perfluoropolyethylene and polytetrafluoroethylene is interposed between boundary surfaces at which, of the plurality of resin-fabricated components, resin-fabricated components of different material slide against one another. 
   
   
     2. The recording medium cartridge of  claim 1 , wherein the amount by mass of the mixture is from 0.01 mg/cm 2  to 0.07 mg/cm 2 . 
   
   
     3. The recording medium cartridge of  claim 1 , wherein a recess portion configured to accommodate the mixture is formed at least one of the boundary surfaces. 
   
   
     4. The recording medium cartridge of  claim 1 , wherein the surface roughness of the boundary surfaces has a maximum height of 5 μm to 50 μm. 
   
   
     5. The recording medium cartridge of  claim 1 , wherein the coefficient of dynamic friction of the boundary surfaces is 0.1 or less. 
   
   
     6. The recording medium cartridge of  claim 1 , wherein a combination of the resin-fabricated components that slide against one another includes a component fabricated of a resin selected from materials which include at least one of polycarbonate, acrylonitrile butadiene styrene and polystyrene as a major constituent and a component fabricated of a resin selected from materials which include at least one of polyacetal, polyamide and polyethylene as a major constituent. 
   
   
     7. The recording medium cartridge of  claim 1 , wherein the resin-fabricated components that slide against one another are urged, respectively, in one direction and an opposite direction. 
   
   
     8. A method of producing a recording medium cartridge which includes a recording medium and a plurality of components fabricated of resin, the method comprising applying a mixture which includes perfluorocarbon, perfluoropolyethylene and polytetrafluoroethylene to at least one of boundary surfaces at which, of the plurality of resin-fabricated components, resin-fabricated components of different material will slide against one another. 
   
   
     9. The method of producing a recording medium cartridge of  claim 8 , wherein the mixture includes, in percentages by mass, 90%±5% of the perfluorocarbon, 3%±2% of the perfluoropolyethylene and 7%±3% of the polytetrafluoroethylene. 
   
   
     10. The method of producing a recording medium cartridge of  claim 8  wherein, after the perfluorocarbon has evaporated from the mixture, the amount by mass of the mixture is from 0.01 mg/cm 2  to 0.07 mg/cm 2 . 
   
   
     11. The method of producing a recording medium cartridge of  claim 8 , wherein a combination of the resin-fabricated components that slide against one another includes a component fabricated of a resin selected from materials which include at least one of polycarbonate, acrylonitrile butadiene styrene and polystyrene as a major constituent and a component fabricated of a resin selected from materials which include at least one of polyacetal, polyamide and polyethylene as a major constituent.